Machine for making curved stereotype printing-plates.



C. E HOPK\NS.

MACHINE FOR MAKING CUBVED STEREOTYPE PRINHNG PLATES.

APPLICATION FILED JAILZZ, 191i.

4 SHEETS-SHEET lmmwwwi NNN APPLICATION FILED JAN. 22. I91]- Patented Dec. 3, 1918. 4 SHEETS-SHEET 2.

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C. E. HOPKINS. MACHINE FOR MAKING,CURVED STEREOTYPE PRINTING PLATES.

. APPLlcATlor FILED 1AN.22,191I. LQSQfiQQW Patented Dec. 3, 1918.

4 SHEETSSHEET 3- C E. HOPKINS. MACHINE FOR MAKING CURVED STEREOTYPE PRINTING PLATES.

APPLICATION FILED JAN. 22! 19H.

Patented Dec. 3, 1918.

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i menace.

Original application filed December 18,1911. Serial No. 666,645. Divided and this application filed. January To all whom itlmay concern:

Whi field,

onrintnsn iterative, or new roan, 1v. :2.

MACHINE ron' ivrnniivocunvnn srnnnorrrn BBINTING-PLATES.

Specification of Letters Patent.

Patented Dec 3, 191 18..

22, 1917. Serial li'o. 143,68ft.

Be it' known that I, Cr mRLn's E: Hornnvs, a citizen of the United States, residing at New York, in the coi'inty otNeiv 1 ork and State of New Yorlnhave invented a new and useful Machine for Making,t/urvedlStereotype PrintingrPlates, of which the following is a specification. i 1 1 This is a division of my application for patent, Serial No. 666,645,filed December 19. 1911.

This invention relates to improvements in mechanism for trimming and shaving curved stereotype printing plates, and for thereafter delivering the trimmed and shaved plates to the cooling mechanism.

The principal objects of the invention are to reduce the detail elements to a minimum as near as possible at the present time, to rcduce the space occupied by all the elements necessary for finishing curved stereotype printing plates ready to be in'nncidiately at tachedto the'cylinders of rotaryweb print ing presses.

from the type portionof the stereotypeplate by an entirely new principle, dispensing with the revolving planetary saw mechanism and the separate means for carrying. the riser free from the machine. i In order to accomplish this I employ a simple tool so mounted that it revolves at considerable speed about the axis of the knife shaft and simultaneously advances toward andthrough the stereotype plate (locked in the arch) from the concaveor axis side and at the proper angle to form the necessary bevel up the ribs cast on the concavesidetand bd heath the typeface of p the stereotype plate. In this invention 1 employa handoperated conveyor-for ,moving the stereotype plate separated riser out of the finishing mecha:

nism. The type face portion is moved over the revolving straight edge finishing cutters and into p os ion onthe cooling mechanism,

ing drawings in whichframe being cross section;

frame;

, plate;

rails of the cooling mechanism. in this way the finished plate aswell as the riser aredee livered back 111 the same position as when picked up by the conveyer, and the 0011- veyeris thus brought to proper position to engage the finished plate. The partsare also left directly in frontof the operator so thathecan pick up'the riser and place it in a chute to convey it to themelting pot, then, inoperation, he opens the valve controlling the flow of water to the cooler; Thereupon thewater rushes into a distributing pipe positioned in the spray pipe and thereafter into engagement with the concave surface of the plate sothat it can be handled.

The invention also involves a safety looking means through which it is impossible to start the finishing mechanism if the conveyer or plate lifter is not 1n proper position or to raise a plate lnto position in the shaving matically stopping the finishing mechanism after 1 each cycle.

vention will appear hereinafter.

Reference 1s to be had tothe accompany;

Figure is a side View of a machine constructed in accordance with this invention showing the coolingmechanismqalined with the finishing mechanism, partof the side brokenaway to show interior construction; j if j Fig.2 is a side elevationof thesame show.- ing the plate carrying framesupported over the inclined core and a stereotype plate (sectional) supported in the finishing mechanism, certain parts being in a longitudinal Fig. 3 is a planofthe machine with the arch of the finishing mechanism removed, H and part of the pouringsheetbroken away; from thecasti-ng mechanism and positioning 1 it in. the finishing mechanism, and thereafter moving both thetype face portion and the Fig. l isa sectional View on the line t e-4rof Fig. 2 showlng the stereotype plate resting on the side Fig. 5 is a centrallongitudinal sectional view ofaportion of the finishing nmcchanism showing the tail severedfrom the arch unless it is in exact position to be fin- I ished. Means isalso provided whereby the operation of the finishing mechanism can be checked at any timeyandzfmeans forautobars of the plate carrying side facing the opposite end of the frame.

By combining the sides of the plate carrying frame and matrix clamp bars, as

stated in my above mentioned original application, the stereotype plate P is formed with an extending lip P along each outside straight edge; this lip is used as a guiding means during the action of conveying the plate from the casting mechanism to and from the finishing mechanism, and is removed by edge trimming cutters. The plate carrying frame C is mounted on rollers 45 which operate on tracks 46 formed on the top surface of the side frames A. These rollers 45 have studs which are mounted in bearings in brackets 47 formed on the side bars 48 of the frame. To the lower side ends of the side bars 48 are secured studs 49 carrying anti-friction rollers 50 which operate in vertical ways 51 on the side frames A.

The core D is pivoted to the frame A by the brackets 40 fast to its bottom end. These brackets are mounted in bearings 53 on cross pieces 54. An inlet water pipe and an outlet water pipe 56 are arranged at opposite ends of said hollow hearings on the brackets 40. The'inlet pipe 55 enters the water chamber 57 of the core at the bottom. The outlet pipe extends along the concave side of the core and into the chamber 57 near the top. Both the inlet and outlet pipes are provided with swivel joints 58 in line with the core pivot axes. This permits the pipes to move with the movement of the core. A controlling valve 59 is positioned in the inlet pipe so that the operator can regulate the supply of water.

The convex face of the core D is provided with the usual grooves 660 forming ribs on the interior face of the plate P under the type matter and is also provided with a re cess 67 on each side near the top for forming conveying lugs P which co-act with the conveyer F as will be described hereinafter.

The side frames are provided with ledges 130 on which is supported the arch G slightly out of axial alinement with the stereotype plate when it rests on the plate carrying frame in horizontal position. The interior circumference of the arch is slightly less than the exterior of the type face por tion of the curved stereotype plate. The driving shaft 131 of the machine operates in the cross frame 133. Fast on this shaft 136 is a gear 138 meshing with a gear 139 loosely mounted on the knife shaft 140. The shaft 131 is provided with a worm 141 fast thereon which drives a worm gear 142 on the knife shaft 140. In this way the knife shaft is driven slowly. The knife shaft is axially alined with the arch and supported in bearings 143 at either end. A shaving knife 144 is fixed to a flange 145 formed along that portion of the knife shaft underneath the arch.

Loosely mounted upon the knife shaft 140 is a support 148. It is attached to and made to travel around with the gear 139, which is loosely mounted on the knife shaft as has been stated. On this support is a tool holder 149 set at an angle. Extending beyond the arch and knife and underneath where the riser portion of the stereotype plate rests when in position to be shaved and trimmed is a simple trimming tool 150 in the tool holder. Said tool and holder are carried by the support 148 loosely mounted on the knife shaft 140. F astened to the knife shaft bearing 143 on the frame 133 and axially positioned with respect to the knife shaft is a round box or cover 151. This envelops the gear 139 and is provided with a cam groove 152 formed in its internal face. Loosely keyed on the knife shaft 140 so as to rotate with it is a sleeve 153. One end of the sleeve is shaped to form a disk 154 and to the opposite end is fastened an arm 155 carrying a roller 156 which operates in the cam groove 152. The disk 154 is made to operate in a groove 157 formed in and thereby causing the tool to pass through the stereotype plate, separate the riser, and thereafter quickly return.

It will be seen that while the knife is caused to make one revolutionwith its shaft 140, the trimming tool 150 is caused to revolve at considerable speed about the axis of the knife shaft 140, and to advance simultaneously at the proper angle away from this axis until it engages the stereotype plate held in the arch. It cuts its way 1'l11.'0l.l; 1l1 so as to separate the riser from the type face and properly bevel ofi the curved edge of the plate (see Fig. 5).

For the purpose of stopping the knife shaft 140 and co-acting mechanism after each cycle of operations, the following mechanism is shown :-A clutch mechanism is provided between the driving pulley 160 and the driving shaft 131 on which this .is held in raised mechanism comprises a movable jaw .161 on the driving shaft, and an opposite jaw 162.

fixed to a sleeve 159 loose on the shaft 131.

The :movable jaw is caused to travel with the shaft through a sliding key 163. The sleeve 159 extends through the shaft bearing and the driving pulley 160 which is keyed to it so that when the clutch jaws are disengaged the pulley160 andits co-acting jaw 162 can continue to run while the knife shaft and co-acting parts are at rest. i

The clutch is held out of operation by the following mechanism :-A roller 164 is fast on a: crossbar l65iand engages in a! groove 166 of the slide jaw 161. A pin 167 positioned on the face of theaknife shaft worm gear 142engages a projection 168 on the crossbar 165. The cross baris forced toward the engaged position by a spring 169.. The clutch end of the cross bar 1s p0 sitioned against the rear cross shaft bearing" 132. It operates about a stud 181 fast on said bearing. The front end, however, is

made to operate in a slot formed on thefront bearing 132. Therefore, the cross bar can be lowered sufficiently to release its projection 168 from engagement with the pin. 167 on the worm gear. This cross bar. 165 position by a connecting link 184. Said link is connected by a stud. 185 to an arm 186 fast on a trip treadle: shaft 187. Onthis shaft is a trip 188 which is pressed down to pull down the connecting link and disengage the cross barprojection.

168 from engagement with the stop pin 167' on the worm gear, thereby releasing thatpart of the mechanism.

On the main driving shaft 131 is the main. driving pulley 160 whichby a belt drives a. flanged pulley 123 on the end of a shaft 125- supported in a bracket 126 fixed to the frame,

A. When the cooler is alined in position to receive a plate, a friction pulley 127 on the shaft 125 engages another friction pulley 128 mountedona shaft 129. Theshaft 129' is positioned near the ends of the cooler frame in bearings, (see Figs. 1 and 4) and:

upon it are 5 mounted two opposite rotary circular straight edge cuttersK which are: let into the guide way. i i

a I will now describe the mechanism Fillustrated in thedrawingsfor conveying, lift ing and locking the stereotype plate in posi-- tionin the arch, and thereafter nearly conveyin itback to the edge trimlnersand Water coo ing mechanism. The stereotype plate lifterand guide ways consists of two long bars: 170 and 171 arranged with their edges alined with, butbelow, the straightedges of the arch G and tied together by cross bars 172 at each end. The plate lifting" frame is pivoted to brackets 1"7E f(Figs. 3 and 7) which are fast on ledges formed at the top of the rear side frameA. The front studoperating in one end of anarm174,

the opposite end being joined b ast11d175 to one end of avsecond arm17 extending upward from a rock shaft 177. This conses quently forms a toggle mechanism through which the operator can raise the lifterand stereotype plate into position in the arch by. moving a lever 178 fast on one end gof the, saidsshaftwl77. j v

. Extending across themachine is a rock shaft 180 operated by a hand lever 281.. On this rock shaft and alined. with the plate lifterare fixed telescoping arms 282, the. topof these arms being joined by a stud 283 to slide pieces 284:. These slide pieces are moved back and forth in recesses 285 formedon the inside faces of the bars 170 and 171 by the aforesaid connections. To the slide pieces 284are fastened extends ing arms 286 each having, a recess 287 into. which engages the lug P of thestereotype plate to be conveyed. Positioning stops 288 are placed in the path of the arms 286 for the purposes of stoppingthe forward move: ment of the conveying mechanism so as to properly position the stereotype platebeneath and within the archreadytobelifted and thereafter shaved and trimmed.

For the purpose of=preventing the machine beingput out of commission through any forgetfulness on the part ofthe op orator, mechanism is provided in the form of safety stops, safety 3 lugs, and tripu toj make it impossible to startthe finishing mechanism 11111885. the differentoperations have been carried out in theproper order and to make it impossible to move any. part of the machine by hand during the cycle of movement after it has been started. The

'conveyer must move forward and @come into? the conveyer and it becomes impossible ,to move elther the lifter or conveyer so long :as the mechanism is in motion. lffit is necessary, however, for any cause a to i stop the mechanism.beforeitffinishes its cycle of operation, the operatorsimply stepsvonua. trip treadle and the mechanism comes to rest. This mechanism will now be described. 'On the togglear1n176'is positioned a bar .190 to engage a bearing 191formed on the face ofthe front telesfope arm 282*at all times except when the conveyeri is insengagement with the positioninglstop 288, in which position, the bearing 191 is beyond the forward end of the bar 190 and the plate lifter can be elevated by the straiglitening out of the toggles whichfstraightening :moves the forward end of thebar190"beyond thebearing 191 on the face of the telescope arm and thereby locks the conveyer between the bearing 191 and the positioning step 288. To prevent the movement of the bar 190 from behind the bearing 191 on the t lescopin arm during the operation of the machine, there is arranged on the end of the toggle shaft 177 a short arm 192-. When the toggles are extended the short arm 192 engages the end of a rocking lock arm 193 on a short shaft 194. On this shaft 194 also is an arm 195 connected to the crossbar 165. The operationof the bar 165'causes the lock arm 193 to move into thepath of the short arm 192 on the toggle shaft and locks the toggles in the extended position. At the same time a hook 196 positioned on the toggle shaft 177 will be disengaged from under a projection 19'? formed on the arm 186 on the trip shaft 187 on which is located the trip treadle 188 for releasing the trip so that the operator can start the mechanism. As the mechanism nears the end of the cycle of motion the pin 167 on the gear 126 engages the projection 168 on the cross bar 165 and forces the bar to withdraw the clutch jaws from engagement whereupon the mechanism stops. In case it should become necessary to stop the mechanism before the end of the cycle the operator pushes down heavily on the trip treadle 188. This movement causes the arm 186 to act with the treadle movement and bring a projection 198 into engagement with the connecting link 184 between the arm 186 and the cross bar 165. This causes the bar 165 to be forced forward so as to throw the movable member of the clutch out of engagement. The treadle 188 is provided with a counterbalance weight 200 to hold the pedal and connecting parts in operative position.

- The operation is as follows :.Starting with the casting chamber open and the core D withdrawn in the position shown in Fig. 2, the operator, having positioned the matrix, now releases the locking hook 115 which holds the core in open position whereupon the core counter-balance 110, which is connected with the core by a flexible connection 111, is free to swing down. This pulls up on and causes the said core to rise and swing inwardly on its pivots toward the back. This allows the plate carrying frame C to r turn on its pivots into vertical position within the back and the further movement of the core toward the back brings the plungers' 86'on the side of the cooler into position. Then the operator pushes down on the operating handle 83 and thereby locks the core and frame in position for casting.

The operator now fills the casting chamher, in any usual manner, as. by means of a pump or ladle; After allowing the proper time for cooling the operator presses down on the handle 83 which actsto first unlock the locking device and thereafter separates the core 1) from the plate carrying frame C in which the cast plate is now held. If there is no cast in the finishing mechanism H to be cooled during the solidifying of the metal in the casting chamber, the operator should open the water valve 59 to allow suflicient water to run into the cooler basin to act as a counter-weight to deliver the cast plate.

The cast plate now being delivered with the plate carrying frame resting on the frame A the operator grasps the hand lever 281 and pushes toward the finishing mechanism. This moves the stereotype plate off the plate'carrying frame C and positions it in the finishing mechanism H. Having the plate located he pushes in on the lever 178 to operate the toggles 17 117 6 and raise the stereotype plate up into the locked position in the arch G. The plate is now in position for finishing. To start the finishing mechanism the operator pushes down lightly on the trip treadle 188.

While the finishing mechanism is operating he repositions the matrix for another cast or positions a new matrix, closes the casting chamber, and fills the chamber with metal. It isduring this time that the finishing mechanism operates to separate the riser from the type face of the stereotype plate as well as to true ofl the ribs beneath the type face. The finishing mechanism having finished its cycle of operation stops automatically as has been stated. The operator by-first pulling out on the lever 178 lowers the toggle mechanism and allows the stereotype plate to come down from engagement with the arch. Then he reverses the lever 281 and pushes the riser and type face portion out of the finishing mechanism over the straight edge tools and into position on the cooler. He picks up the riser and returns it to the melting pot through the ordinary chute, (not shown) or by hand, and then opens the water supply by pushing down on the push valve 101. As soon as the plate sufiiciently cools. he lifts it free from the machine by hand and then proceeds with the series of operations again.

Although I have illustrated and described a preferred embodiment of the invention showing details of the various mechanisms, I am aware that the principles of the inven tion can be carried out in other forms and with other details of construction without departing from the scope of the invention as expressed in the claims. Therefore I do not wish to be limited to all the details herein shown and described, but what I do claim 1s:

1. In a stereotype plate finishing machine, the combination with an arch for receiving the plate, a support-adjacent to said arch,

masses and means for engaging the plate whileon the support, moving it into the arch, and moving it back again on the support.

2. In a stereotype plate finishing machine, the combination with a shaving arch for re-. ceiving a plate, a support substantially in axial alinement therewith for a plate, means for raising a plate in the arch, and means for engaging a plate on said support, mov ing it into the arch, retaining its engagement therewith, and moving it back again on the support. p 1

3. In a stereotype plate finishing machine, the combination with a shaving arch for receiving a plate, means for moving the plate radially to seat it in said arch, a support.

nearlv in axial alinement with said arch, and a oonveyer for engaging a plate on said support, moving it into the arch, retaining its engagement with the plate while being moved radially, and moving the plate out of the arch.

4a In a machine for finishing curved stereotype plates, the combination of a plate supporting arch, a knife shaft axially alined with said arch, a trimming tool operative at an inclination with respect to the knife shaft axis and within the radius of said arch, and means for revolving the knife shaft and trimming tool at difl'erent speeds for the purpose set forth.

i 5. In a machine for finishing curvedl stereotypeplates, the combination of a plate sup port, an arch, means for conveying aplate from the upport, to and beneath the arch, means for holding the ,plate in. the arch, means for shaving the interior of the plate, means for separating the riser from said 1 plate. and edge trimming tools. 40.

- the combination with a shaving arch. an

6. In a stereotype plate finishing machine,

axial shaft therein having ashavingknife thereon, a support adjacent to said arch for the plates. a reclprocating convever having a notch forreeeiving a projection on the plate while on the support, manually operated means for moving the conveyer inand through the arch to posftion the plate mythe archand thereafter move it back out of the arch on said support. means for seating the plate in thearch while said conveyer is 1n operative engagement with said proiec ion,

and means for operating the shaving blade to shave the plate. 9

7. lln a stereotype plate finishing machine, the combination of a driving shafhashav ing shaft having a shaving blade fixed thereon, means for driving the shaving shaft slowly from the driving shaft, a support rotatablv mountedon the shavingshaft. means for driving saidlsupport from the driving shaft at a higher rate of speed than the shaving shaft, a; cutting tool movably carried by said support, and means, caused to operate by the diflerence in velocity rotastationary bearing therefor,

, whereby as the shaft tion'betweenthe shaving shaft and support,

for reciprocating said tool as it rotates. 8. In a stereotype plate finishing machine, the combination of a driving shaft, a shaving shaft driven thereby,-a tool support rotatablymounted on the shaving shaft, means connected with the driving shaft for rotatingthe tool support at a different rate of speed than the shaving shaft, said support having a guide at an angle to its axis, a tool holder mounted to move along said guide, and meansadjacent to said support for mov ing the tool holder out and in guide as the shaving shaft rotates.

9. In a stereotype plate finishing machine, the combination of a shaving shaft, a tool. support rotatablymounted on the shaving shaft, means for rotating the tool support along its with respect tothe shaving shaft, said sup 1 guide, means adjacent to said supportfor moving the tool holder along its guidejas the shaving shaft rotates, and stationary means for controlling the tool movin means. 10. In a stereotype plate finishlng machine, the combination of a shaving shaft, 21-

having an internalcamyadisk loosely keyed to said shaft and having means engaging saidcam rotates the disk. will reciprocate; axially, a support loosely mounted on said shaft, means independent of said shaft for rotating said support,said support having a guide at anangle to the axis of the shaft, a tool holder movablealong said guide andconnected with saiddiskto bereciprocated thereby in its guideas the support rotates. i 11. in astereotypeplate finishing machine, thecombination of a shaving shaft, a stationary bearing therefor. a cam fixed to said bearing, a sleeve loosely keyed to said shaftand having means engaging said cam whereby as theshaft rotates the sleeve will reciprocate axially and having a disk said support having a.

lJOOlllOlClQI movable along said guide and i connected with said disk tobe reciprocated thereby 1n itsguide as the support rotates,

and means for automatically stopping the shaving knifeshaft upon the completion of one revolution.

12. In a machine for finishing curved stereotypeplates. the combination ofan arch, a shaft axially alined with said arch, atool operated by saidshaft and arranged tooperate from the inside of the plate to true out the concavity of the plate and a tool movable relatively to the first named tool butals o operated by said shaft to separate the riser portion therefrom.

13, In a machine for finishing curved stereotype plates, the combination of a frame, an arch supported by said frame, a shaft supported by said frame and axially alined with the arch, a shaving knife on the shaft, a trimming tool revolving about the axis of the shaft, and means for advancing the trimming tool toward the arch from the inside thereof.

14:. In a machine for finishing curved stereotype plates, the combination of a plate support, a cutter alined with the support, means for rotating the cutter and simultaneously advancing said cutter toward and through the said plate radially from the inside thereof.

15. In a machine for finishing semitubular stereotype plates, the combination of means for supporting a semi-tubular plate, a cutting tool support axially operative in said plate, and means for causingsaid tool to revolve about the axis of the plate and to advance outwardly toward and through the said plate so as to form a bevel on its curved edge.

16. Ina machine for finishing curved stereotype plates, the-combination of a plate conveyer, a plate lifter, a starting mechanism, and means whereby the conveyer and lifter are inter-locked to operate position by the starting mechanism.

17. In a machine of the character described,.the combination of a finishing mechanism, aconveyer for conveying a plate into the finishin mechanism, means for operating the finis ling mechanism, and means for preventing the starting of the finishing mechanism if the conveyer is not in proper position to brin a plate intoposition to'be operatedon by t e finishing mechanism.

181 In a machine of the character de scribed, the. combination of a finishing mechanism, a conveyer for conveying a plate into the finishing mechanism, means for operating the finishing mechanism, and means for preventing the starting of the finishingmechanismunless the different operations are carried through in sequence.

19. In a machine of the character described, the combination with an arch, of a finishing mechanism adapted to operate on a plate in the arch, and a plate lifter for lifting a plate into proper position in the arch, of means for preventing the starting of the finishing mechanism if the-plate litter is not in proper position to raise a plate into position in thea'rch.

20. In a stereotype plate finishing machine, the combination of an arch, finishing mechanism in the arch, a' conveyer for moving a plate into the arch, a plate lifter for moving the plate into registration with the finishing mechanism, means for operating the finishing mechanism, means whereby the machine can be stopped at any point during the finishing operation, and means for automatically stopping the machine on the completion of a cycle of operations.

21. In a stereotype plate finishing mechanism, the combination of an arch, a conveyer for moving a plate under the arch, a manually controlled lifter for lifting a plate into the arch from the conveyer, a starting device, and means whereby the act of setting the starting device into operation locks the plate lifter in its elevated position and at the same time locks the conveyer in position, whereby it is impossible to move the plate litter or conveyer out of position while the machine is operating.

22. In a stereotype plate finishing mechanism, the combination of an arch, a conveyer for moving 'a plate under the arch, a manually controlled lifter for lifting a plate into the arch from the conveyer into registration with the finishing mechanism, a starting device, and means whereby the act of setting the starting device into operation locks the plate lifter in its elevated position and at the same time locks the conveyer in position, and a trip treadle having means for stopping the mechanism at any time during its cycle of operations.

23. In a stereotype plate finishing machine, the combination with a shaft having finishing means thereon, and an arch adjacent thereto for receiving a plate to be finished, of a pair of horizontal bars for engaging the'edges of the plate, a toggle mech' anism connected with said bars, and operating means for operating the toggle mechanism to raise the 'bars andlift the plate into the arch.

24. In a. stereotype plate finishing machine, the combination with ashaft having finishing means thereon, and' an arch adjacent thereto for-receiving a plate to be finished, of a pair of horizontal bars for engaging the edges 'of the plate,"a toggle mechanism connected with saidbars, operating means for operating the toggle mechanism to raise the bars and lift the plate into the arch, and a conveyer movable into position under the arch for bringing a plate over said bars.

25. In a stereotype plate finishing machine, the combination with a shaft having finishing means thereon, and an arch adjacent thereto, of a pair of bars for engaging the edges of the plate, a toggle mechanism connected with said bars, means for operating the toggle mechanism to raise the bars and lift the plate into the arch, a conveyer movable into position under the arch for bringing a plate over said bars, the toggle levers being provided with a bar, and the conveyer having an arm which the last"! named bar engages at all times except when the conveyer is at its limiting position under. the; arch, and means for permitting the operation of said toggle levers when the bar and arm are in contact.

26. In a stereotype plate finishing machine, the combination With a shaving arch ,7 plate in the arch.

27. In a stereotype plate finishing machine, the combination with a shaving arch and finishing devices therein, of a conveyer movable axially to bring the plate into position under the arch, means movab1etransversely to the motion of the conveyer for engaging a plate in the conveyer and bring mg it to a seat in the arch, means whereby the operation of said movable means locks the conveyer 1n posltion, means for locking the transversely moving means in its extended position whenit has seated a plate in the arch, a trip treadle for starting the mechanism, and means for locking the trip treaclle in inoperative position, the last named means being connected With the sec- ,ond named locking meansto be disengaged thereby when the second named locking means is brought into operative position.

28. In a machine for finishing curved stereotype plates, the combination of an arch, a shaft axially alined With said arch,

and a beveling trimming tool, movable rela tively to and also with said shaft operative from the inside of a curved plate, and arranged to separate the riser and simultaneously bevel the curved edge of a plate for the purpose set forth. a

In testimony whereof I have hereunto aflixedmy signature.

CHARLES E. HOPKINS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Watentn, Washington, D. G. 

